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Liquefied Natural Gas

Cryogenic natural gas cargoes matched to terminal and downstream requirements.

Commercial overview

Contract basis,
clearly defined.

LNG has no single universal composition. Every cargo is contracted to a composition and energy window compatible with the loading and receiving terminals. The specification therefore records reportable properties and agreed acceptance ranges rather than a generic fixed assay.

Reference basisContract-defined cargo matrix
Detailed specification

Quality acceptance matrix

Values are commercial reference points—not an offer or automatic guarantee. Use the current official standard and agreed contract schedule for procurement.

ParameterReference requirementTest method / basis
MethaneReported mol% — source and contract specificISO 6974 series
EthaneReported mol%ISO 6974 series
Propane and heavier hydrocarbonsReported mol% / terminal limitsISO 6974 series
NitrogenReported mol% / terminal maximumISO 6974 series
Carbon dioxideTerminal maximumApproved gas chromatography
Hydrogen sulfide / total sulfurTerminal and pipeline limitsISO / ASTM agreed method
Gross calorific valueAgreed MJ/m³ or MMBtu basisISO 6976
Wobbe indexReceiving-grid windowISO 6976
DensityCalculated at custody conditionsISO 6578 / agreed equation
Delivery temperatureNormally near −162°C; terminal window controlsCustody instrumentation
PressureShip / terminal interface specificCustody instrumentation
Water / mercuryLiquefaction and terminal limitsAgreed laboratory method
Applications

Where the product is used

  • Power generation
  • City-gas networks
  • Industrial energy
  • Marine bunkering
Required documents

Transaction file

  • Certificate of quality and composition
  • Custody-transfer report
  • Certificate of origin
  • Cargo manifest and bill of lading
  • Compatibility and terminal nomination documents
Primary reference

Verify the current edition

Standards are revised over time. Procurement must confirm the current edition and destination law.

ISO 16903 LNG guidance ↗
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